Issued: 17/11/
Last Updated: 17/11/
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Purpose
The purpose of this safety alert is to:
- highlight the need to follow the manufacturer’s operating instructions
- provide safety guidance for workers, owners and employers.
Manufacturers and suppliers must ensure that mobile concrete placing booms are designed to be stable when used in accordance with their operating instructions.
Background
On 31 August , a 37-metre mobile concrete placing boom became unstable while the operator was unfolding the boom. The truck cabin lifted off the ground with the unit balancing on its rear outriggers (refer Photograph 1). At the time of the incident, the boom’s hopper and pipeline were filled with concrete.
Photograph 1: Unit pivoting on rear outrigger feet.
Contributing factors
The initial investigation indicates the mobile placing boom was being operated outside of the manufacturer’s operating instructions. The manufacturer’s instructions stated the boom was not permitted to be operated in the range extending 30 degrees either side of the hopper (the restricted operating zone - refer Diagram 1). It appears the unit was unfolded within this restricted operating zone. The boom was not fitted with a device to prevent it being moved into the restricted operating zone. However, other contributing factors may be identified as the investigation continues.
At the time of the incident, the carrier was set up at a small operating angle that appeared to be within the maximum operating ground angle of 3 degrees specified in the operating manual.
Diagram 1 – Restricted operating zone for the unit involved in this event (highlighted in red).
Action required
Setting up a mobile concrete placing boom
When setting up a mobile concrete placing boom, operators should ensure the area is level to within the manufacturer's specifications, capable of supporting the load and free of obstructions. Operators should refer to the Concrete Pumping Code of Practice (PDF, 1.04 MB) for further information about items that require careful attention when setting up a mobile concrete placing boom.
Operating a mobile concrete placing boom
Different makes and models of mobile placing booms have different operating restrictions. As seen with this incident, booms are not always capable of being used through a full 360 degrees. While some of these mobile concrete placing booms have systems to prevent the boom being used in restricted zones, these systems are not fool proof and do not replace the requirement for operators to be trained in, and familiar with the operating instructions. The permissible working zone of a boom is not always documented in the product brochure (e.g. range charts), however operators should be aware that it can be found in the operating manual.
Level indicators
All mobile concrete placing booms should be fitted with level indicators, one on each side of the unit. Level indicators provide the operator with accurate information about the level of the carrier and the maximum allowable operating angle. These indicators should measure the chassis angle in two directions—in line with the vehicle and at right angles to the vehicle.
Check level indicators daily for damage and if they are mounted on springs (refer Photograph 2), check that no foreign material has been wedged under the indicators. Level indicator accuracy should be checked for correct calibration at intervals not exceeding 12 months.
Photograph 2: Example of a multi directional level indicator mounted on springs.
Training
It is important owners and operators are familiar with the manufacturer’s operating manual. Section 19(3)(f) of the Work Health and Safety Act and section 39 of the Work Health and Safety Regulation require a person conducting a business or undertaking to provide, training and instruction to workers. Documented familiarisation training should be provided to all operators for each make and model of mobile concrete placing boom they are required to operate. It is preferable that the training is broken up into a checklist and is more than a generalised statement that an operator has read and understood the operating manual.
At a minimum, training should include:
- ground type and minimum size of pads and dunnage under outrigger feet
- maximum allowable ground slope and carrier angle (the ground slope and carrier angle can differ depending on how the outrigger rams are deployed)
- allowable operating range of the boom both for deployment and operation
- method of unfolding and folding boom (on some booms it is possible to damage the boom if it is folded or unfolded incorrectly)
- safety precautions that must be followed where short-legging is permitted by the manufacturer
- pump and hopper operation
- pipeline and clamp inspection
- safe methods of cleaning the hopper and lines
- how to carry out a daily inspection of the plant
- precautions before and during road travel.
Stability testing of mobile concrete placing booms
Australian Standard AS .15 – Cranes (including hoists and winches) Concrete placing equipment sets out stability benchmarks for mobile concrete placing booms. Importers and suppliers of mobile concrete placing booms should carry out stability testing in accordance with AS .15. This should be completed for every combination of carrier on which a boom is mounted. The testing should be conducted in the least stable position within the permissible working zone.
Further information
Placing boom concrete pump, exactly speaking, is a flexible concrete placing boom connected to a concrete trailer pump or a concrete pump truck. It is mainly composed of tower, turnable, balance arm, boom assembly, hydraulic system, electrical control system, etc.. In construction process, placing boom concrete pump plays an important role on delivering and pumping concrete materials. It is widely used in various construction projects.
Full Hydraulic Drive / Smooth & Stable Performance
Simple Installation & Convenient Transportation
Easy Operation And Maintenance
Require Professional Operator
Hot-sale Models Of LUTON Concrete Placing Boom
Why Is Placing Boom Concrete Pump So Popular
Just like a huge mechanical arm, it can deliver high-pressured concrete mixture to the construction site. Compared with other concrete conveying equipment, it has a wider application range, with more flexible operation and higher pouring efficiency. Placing boom pump now has been widely used in building construction, high-speed railway construction, road and bridge constuction, water conservancy and hydropower and other projects.
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High Production Efficiency
With wide placing range, flexible operation and efficient conveying system, placing boom can quickly and continuously transport concrete materials to any pouring part of the construction site.
Strong Assurrence Of Concrete Quality
As a concrete conveying equipment cooperated with concrete pump, placing boom conveys concrete mixture to pour points stably and evenly, ensuring the concrete quality.
Time And Labor Saving
The high automation of placing boom pump avoid many unavoidable troubles from manual methods. It greatly reduces the labor intensity and shortening the construction period.
Long Service Life
Because the placing boom rod does not directly contact with the framework and the building structure, it avoids the incurable damage to the structure due to vibration and burst mode.
LUTON Concrete Placing Boom Pump
LUTON placing boom machine, driven by hydraulic energy, further improves the pouring efficiency and the operating mode. It also effectively reduces labor costs. It is a new type of intelligent placing boom machine.
First of all, the new full hydraulic boom technology adopts an R-shaped three section folding arm structure. It makes the boom placer with 360°full rotation. And it can also complete the boom’s pitch variation, as well as arm extension and folding movements.
Second, without affection by the sizes and shapes of the construction layers, LUTON boom machine can adapt to various construction environment.
Then, LUTON concrete placing boom pump has compact structure, capable of lifting and shifting, without need for fixation. It can be lifted to a suitable pouring location, and can be used on floors and platforms, with strong flexibility and maneuverability.
What’s more, LUTON boom placer has simple operation, scientific safety protection device. It is so economical and efficient, and more suitable for high-rise and super high-rise construction projects with hoistway.
Types of Placing Boom Concrete Pump
Now placing boom concrete pumps have been participating in various construction engineering fields more and more widely and deeply. Various types of concrete placing boom have emerged, to meet the needs of concrete pouring and pumping in different engineering projects. At present, there are some types of concrete placing boom pump in the market:
Floor Type
Mobile Type
Elevator Shaft Type
Ship-mounted Type
Applications Of Placing Boom Concrete Pump
At present, placing booms are mainly used in building construction, road and bridge engineering, tunnel construction, and water conservancy and hydropower engineering fields, and so on.
First, concrete placing boom machine can be used to lay and pour floors, walls, roofs, columns, beams and other structures. It ensures the structural strength and waterproofing of buildings.
Second, in road construction projects, concrete spider placer can achieve automated pouring of road surfaces, shoulders, drainage ditches, etc. It ensure the smoothness, structural strength, and bearing capacity of the road.
Third, in bridge construction, concrete placing boom can also be used for pouring bridge decks, piers, and columns to ensure the structural strength and durability of the bridge.
Also, in tunnel construction, placing boom machines are used for laying and reinforcing tunnel walls to ensure the stability and waterproof performance of the tunnel.
What’s more, in the field of venue construction, placing boom machines are mainly used to lay and harden the surface of the venue for vehicles and personnel to pass through.
With the continuous increase in construction demand, the production technology of Placing boom concrete pump will be improve continuously. And they will play important roles in more and more construction fields.
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